Aubert, B. et al. (2009) Search for the rare leptonic decays B+→l+νl (l=e,μ). Physical Review D, 79 (9). 091101. ISSN 1550-7998

We have performed a search for the rare leptonic decays B+→ℓ+νℓ(l=e,μ), using data collected at the Υ(4S) resonance by the BABAR detector at the PEP-II storage ring. In a sample of 468×106 BB̅ pairs we find no evidence for a signal and set an upper limit on the branching fractions B(B+→μ+νμ)<1.0×10-6 and B(B+→e+νe)<1.9×10-6 at the 90% confidence level, using a Bayesian approach.